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Old 06-09-2012, 07:18 AM
chirorod chirorod is offline
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Join Date: Nov 2007
Location: Florence, MA
Age: 84
Posts: 724
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The offset keys are just that. The standard keys are simply keys. Offset keys are keys with an offset. This allows you to change cam timing. What is being suggested is that your cam timing is not set correctly, and that part of your problem might be that someone used an offset key. It sounds like this engine has had some modifications to increase horsepower. This means that someone with not much experience can run into confusion.
It might be best to tear it back down and measure everything, including bore, piston sizing, rings, valve stems, valve guides.
The engine might have been run with valves hitting pistons, thus bending valves. If that happened, it would explain stuck valves. And that would probably mean new valve guides and new valves where necessary. Piston damage would also mean new pistons. And it would mean that the cam lift and/or cam timing might be too much for those pistons.
I'm thinking that previous work might have been more than a little haphazard, which would reinforce the idea of starting from scratch. This could be a terrific learning experience, since you would have to figure out just about everything about an engine.
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